When a cool gas is placed between a glowing wire filament source and a diffraction grating, the resultant spectrum from the grating is which one of the following?
a. line emission
c. line absorption
b. continuous
d. monochromatic
C
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A satellite near Earth makes a full circle in about 90 minutes. Much farther from Earth, say at the distance to the Moon, time for a full circle would be
A) 90 minutes. B) less than 90 minutes. C) about 28 days. D) not enough information E) none of the above
A lunar month is about 28 days. If the Moon were closer to Earth than it is now, the lunar month would be
A) more than 28 days. B) unchanged at 28 days. C) less than 28 days.
An initially uncharged parallel plate capacitor of capacitance C is charged to potential V by a battery. The battery is then disconnected. Which statement is correct?
a. There is no charge on either plate of the capacitor. b. The capacitor can be discharged by grounding any one of its two plates. c. Charge is distributed evenly over both the inner and outer surfaces of the plates. d. The magnitude of the electric field outside the space between the plates is approximately zero. e. The capacitance increases when the distance between the plates increases.
A loop of wire (resistance = 2.0 m?) is positioned as shown with respect to a long wire which carries a current. If d = 1.0 cm, D = 6.0 cm, and L = 1.5 m, what current is induced in the loop at an instant when the current in the wire is increasing at a rate of 100 A/s?
a.
34 mA
b.
30 mA
c.
27 mA
d.
38 mA
e.
0.50 mA